作定语的名词往往是说明其中名词的材料、用途、时间、地点、内容、类别等。

⒈材料
a diamond necklace
a bamboo pole
paper money
a stone bridge 
⒉用途
a meeting room
the telephone poles
the railway staion
trade union
water pipe
welcome speech
eye drops

⒊时间
a day bed
the dinner party
the apring and autum period
evening suit
midday lunch
⒋地点
london hotels
beijing university
body temperature
the spaceship floor
the kitchen window
⒌内容
a story book
piano lessons 
the sports meet
oxygen supply
the air pressure
the grammar rules
⒍类别
children education
enemy soldiers
a bus driver